1. Biopsychological Domain

2. The Nervous System and the Endocrine System

3. Neurons: The Building Blocks of the Nervous System

4. Nervous System The electrochemical communication system of the body Sends messages from the brain to the body for movement Brings information to the brain from the senses

5. Neuron A nerve cell; the basic building block of the nervous system Neurons perform three basic tasks –Receive information –Carry the information –Pass the information on to the next neuron

6. Parts of the Neuron

7. Parts of the Neuron - Dendrites Dendrite – The branching extensions of a neuron that receive information and conduct impulses toward the cell body

8. Parts of the Neuron - Soma Soma – The cell body of a neuron, which contains the nucleus and other parts that keep the cell healthy

9. Parts of the Neuron - Axon Axon – The extension of a neuron through which neural impulses are sent

10. Parts of the Neuron – Myelin Sheath

11. Parts of the Neuron - Terminals Axon terminals – The endpoint of a neuron where neurotransmitters are stored

12. How Neurons Communicate: The Neural Impulse Module 6: The Nervous System and the Endocrine System

13. Action Potential A neural impulse; a brief electrical charge that travels down the axon of a neuron Considered an “on” condition of the neuron

14. Action Potential

15. Refractory Period The “recharging phase” during which a a neuron, after firing, cannot generate another action potential Once the refractory period is complete the neuron can fire again

16. Refractory Period

17. Resting Potential The state of a neuron when it is at rest and capable of generating an action potential The neuron is set and ready to fire

18. Resting Potential

19. All-or-None Principle The principle stating that if a neuron fires it always fires at the same intensity All action potentials are of the same strength. A neuron does NOT fire at 30%, 45% or 90% but at 100% each time it fires.

20. How Neurons Communicate: Communication Between Neurons Module 6: The Nervous System and the Endocrine System

21. Synapse The tiny, fluid filled gap between the axon terminal of one neuron and the dendrite of another neuron The action potential cannot jump the gap

22. Neurotransmitters A chemical messenger that travels across the synapse from one neuron to the next Can influence whether the second neuron will generate an action potential or not

23. Neurotransmitters

26. How Neurons Communicate: The Neural Chain Module 6: The Nervous System and the Endocrine System

27. Receptor Cells Specialized cells in the sensory systems of the body that can turn other kinds of energy into action potentials (neural impulses) that the brain can process Receptor cells in the eye turn light into a neural impulse the brain understands.

28. Sensory Nerves Nerves that carry information from the sensory receptors to the spinal cord and brain. Connect the sense organs to the brain and spinal cord

29. Interneurons Nerve cells in the brain and spinal cord responsible for processing information Related to sensory input and motor output

30. Motor Nerves Nerves that carry information from the brain and spinal cord to the muscles and glands. Carries messages from the brain and spinal cord to other parts of your body

31. A Neural Chain

36. The Structure of the Nervous System Module 6: The Nervous System and the Endocrine System

37. The Nervous System

38. Central Nervous System (CNS) The brain and spinal cord The brain is the location of most information processing. The spinal cord is the main pathway to and from the brain.

39. Divisions of the Nervous System

40. Peripheral Nervous System (PNS) The sensory and motor nerves that connect the brain and the spinal cord to the rest of the body Peripheral means “outer region” The system is subdivided into the somatic and autonomic nervous systems.

41. Divisions of the Nervous System

42. Somatic Nervous System The division of the peripheral nervous system that controls the body’s skeletal muscles Contains the motor nerves needed for the voluntary muscles

43. Divisions of the Nervous System

44. Autonomic Nervous System The division of the peripheral nervous system that controls the glands and muscles of the internal organs Monitors the autonomic functions Controls breathing, blood pressure, and digestive processes Sub-divided into the sympathetic and parasympathetic nervous systems

45. Divisions of the Nervous System

46. Sympathetic Nervous System The part of the autonomic nervous system that arouses the body to deal with perceived threats Fight or flight response

47. Divisions of the Nervous System

48. Parasympathetic Nervous System The part of the autonomic nervous system that calms the body Brings the body back down to a relaxed state

49. Divisions of the Nervous System

50. The Sympathetic and Parasympathetic Divisions of the Autonomic Nervous System

57. The Endocrine System Module 6: The Nervous System and the Endocrine System

58. Endocrine System One of the body’s two communication systems A set of glands that produce hormones-- chemical messengers that circulate in the blood

59. Hormone Chemical messengers produced by the endocrine glands and circulated in the blood Similar to neurotransmitters in that they are also messengers Slower communication system, but with longer lasting effects

60. Pituitary Gland The endocrine system’s gland that, in conjunction with the brain, controls the other endocrine glands Called the “master gland” Located at the base of the brain and connects to the hypothalamus

61. Endocrine System – Pituitary Gland

62. Thyroid Gland Endocrine gland that helps regulate the energy level in the body Located in the neck

63. Endocrine System – Thyroid Gland

64. Adrenal Gland Endocrine glands that help to arouse the body in times of stress Located just above the kidneys Release epinephrine (adrenaline) and norepinephrine (noradrenaline)

65. Endocrine System – Adrenal Gland

66. Pancreatic Gland Regulates the level of blood sugar in the blood

67. Endocrine System – Pancreatic Gland

68. Sex Glands Ovaries (females) and testes (males) are the glands that influence emotion and physical development. Testosterone – primary males hormone Estrogen – primary female hormone Males and females have both estrogen and testosterone in their systems.

69. Endocrine System – Sex Glands

70. The End